Mixed Growth and Mid-Stream Samples
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1 Date of Search: 5 Dec 16 Sources Searched: Medline, Embase, DynaMed, NHS Evidence. Summary: Mixed Growth and Mid-Stream Samples Evaluating urine culture findings has long been dominated by Kass s criteria for significant bacteriuria. Kass found that 95% of women with pyelonephritis had 1 8 CFB/L ( 1 5 CFU/mL) or one bacterial species in a clean-catch mid-stream urine, and that such a finding in two consecutive mid-stream urine specimens in asymptomatic women would, with 95% probability, give the same result in a third mid-stream urine specimen (Kass EH. Trans Assoc Am Phys 1956; 69: 56-63; Kass EH. In: Quinn Biology of pyelonephritis. Boston: Little & Brown; 196. p ). Kass also showed that <1 7 CFB/L indicated contamination during sample collection, whereas bacterial concentration in the interval of <1 8 CFB/L was difficult to interpret. Despite the fact that the criteria were developed for acute pyelonephritis and asymptomatic bacteriuria in women, they began to be used generally, even for symptomatic lower urinary tract infection. Source: Health Protection Agency: Diagnosis of UTI URL: quick_ref_guidelines.pdf The significance of polymicrobial growth in urine: Contamination or true infection Author(s): Siegman-Igra Y.; Kulka T.; Schwartz D.; Konforti N. Source: Scandinavian Journal of Infectious Diseases; 1993; vol. 25 (no. 1); p Publication Date: 1993 Abstract: Urine growing more than one organism is usually considered contaminated. During , among 198 episodes of urosepsis with at least one identical organism in blood and urine, there were 62 with polymicrobial growth from urine. The significance of the multiple growth from urine was confirmed in 12 episodes by the growth of more than one identical organism in blood and urine and in 21 episodes by repeated growth of the same mixture of organisms in multiple urine specimens. Escherichia coli had a higher tendency to invade blood stream than other Gram-negative organisms, such as pseudomonas and proteus. In specific populations with high risk of polymicrobial infection, multiple growth in urine should be carefully evaluated with appropriate colony count and identification of each isolate. Database: EMBASE The significance of urine culture with mixed flora. Author(s): Siegman-Igra, Y Source: Current opinion in nephrology and hypertension; Nov 1994; vol. 3 (no. 6); p Publication Date: Nov 1994 Abstract:Urine cultures that contain more than one organism are usually considered contaminated. The frequency with which such growth truly represents mixed infection is unknown. Surprisingly few studies have evaluated the clinical significance of polymicrobial growth from urine. Such significance was demonstrated in these studies either by recovering the same combination of microorganisms from blood and urine, in cases of urosepsis, or by the reproducibility of the same mixture of bacteria from sequential urine cultures. In certain clinical settings, polymicrobial bacteriuria is not only
2 frequently significant but its overall clinical impact seems to be substantial. Bacteriuria associated with long-term catheterization, the most common nosocomial infection in American medical care facilities, is predominantly polymicrobial. Symptomatic urinary tract infection is a common outcome of such bacteriuria and has been associated with increased risk for bloodstream infections and excess mortality. Early species identification and antimicrobial susceptibility testing of each urinary isolate may be of paramount benefit to the care of these patients. We believe that in properly collected urine samples, multiple growth often represents true mixed infection and should therefore be completely evaluated. Database: Medline Urine culture contamination. Author(s): Washington, J A Source: Archives of pathology & laboratory medicine; Feb 1998; vol. 122 (no. 2); p Publication Date: Feb 1998 Available in full text at Archives of Pathology and Laboratory Medicine - from ProQuest Database: Medline Urine specimen contamination: How dirty is too dirty? Author(s): Metzger G.D. Source: Clinical Laboratory Science; 1994; vol. 7 (no. 2); p Publication Date: 1994 Database: EMBASE Revisiting urine culture contamination. Author(s): Fuchs PC Source: MLO: Medical Laboratory Observer; Jul 1994; vol. 26 (no. 7); p Publication Date: Jul 1994 Database: CINAHL Defining urine culture contamination. Author(s): Fuchs PC Source: MLO: Medical Laboratory Observer; Feb 1994; vol. 26 (no. 2); p Publication Date: Feb 1994 Database: CINAHL A novel midstream urine-collection device reduces contamination rates in urine cultures amongst women. Author(s): Jackson, Simon R; Dryden, Mathew; Gillett, Paul; Kearney, Paddy; Weatherall, Rosemary Source: BJU international; Aug 25; vol. 96 (no. 3); p Publication Date: Aug 25 Available in full text at BJU International - from John Wiley and Sons
3 Abstract:To evaluate a novel urine-collection device (UCD) that automatically collects a midstream urine (MSU) sample, and compare contamination rates to those of the conventional MSU sampling method, as the contamination of urine samples for microbiological analysis in women leads to diagnostic ambiguity and unnecessary costs, and may result in part from an incorrect collection procedure. In all, 2823 women from four centres, most from antenatal clinics, were randomized to two urine-collection methods: conventional MSU collection and collection with a novel MSU UCD (the Whiz, JBOL Ltd, Oxford, UK). Semi-quantitative growth and user acceptability were compared between the collection methods. MSU samples collected with the UCD had significantly fewer mixed growth samples (9% vs 14%, P =.1; 36% relative reduction), significantly fewer heavy mixed growth samples (1.2% vs 3.%, P =.4; 6% relative reduction) and required significantly fewer retests (11% vs 16%, P =.2; 31% relative reduction). There were more samples with clinically insignificant growth than the conventional MSU group (86% vs 82%, P =.5). Those using the UCD preferred it to the conventional method (67.5%) and experienced significantly less spillage during sample collection (27% vs 46%, P =.1; relative reduction 41%). The UCD reduced contamination rates in urine samples and improved the predictive value of the urine culture in a manner acceptable to patients and staff. Database: Medline The laboratory diagnosis of urinary tract infection Author(s): Graham J.C.; Galloway A. Source: Journal of Clinical Pathology; 21; vol. 54 (no. 12); p Publication Date: 21 Available in full text at Journal of Clinical Pathology - from Free Access Content Abstract:Urinary tract infection is common, and it is not surprising that urine specimens make up a large proportion of those samples submitted to the routine diagnostic laboratory. Many of these specimens will show no evidence of infection and several methods can be used to screen out negative samples. Those that grow bacteria need to be carefully assessed to quantify the degree of bacteriuria and hence clinical relevance. To influence treatment, a final report should be produced within 24 hours of specimen receipt, with turnaround times continuously monitored. Much work needs to be done to determine the cost effectiveness involved in processing urine specimens and the evidence base for the final report provided. Database: EMBASE Urine culture contamination: a College of American Pathologists Q-probes study of contaminated urine cultures in 96 institutions. Author(s): Valenstein P; Meier F Source: Archives of Pathology & Laboratory Medicine; Feb 1998; vol. 122 (no. 2); p Publication Date: Feb 1998 Available in full text at Archives of Pathology and Laboratory Medicine - from ProQuest Database: CINAHL
4 Strategy 9239 # Database Search term Results 1 Medline (PCR).ti,ab Medline ("protein creatinine ratio").ti,ab Medline (PCR).ti,ab OR ("protein creatinine ratio").ti,ab Medline ("mixed growth").ti,ab Medline ((PCR).ti,ab OR ("protein creatinine ratio").ti,ab) AND ("mixed growth").ti,ab 5 6 Medline (contamin*).ti Medline (midstream OR "mid stream").ti Medline ("mixed growth").ti,ab AND (midstream OR "mid stream").ti 9 Medline (msu).ti Medline ("mixed growth").ti,ab AND (msu).ti 11 Medline ("mid urine stream").ti 12 Medline (contam* ADJ4 "mixed growth").ti 13 EMBASE ("mixed growth").ti,ab EMBASE (midstream OR "mid stream").ti EMBASE (msu).ti EMBASE (midstream OR "mid stream").ti OR msu EMBASE ("mixed growth").ti,ab AND 3 ((midstream OR "mid stream").ti
5 OR (msu).ti) 18 EMBASE exp "BACTERIUM EMBASE ((midstream OR "mid stream").ti 8 OR (msu).ti) AND exp "BACTERIUM 2 EMBASE (retest* OR "re test*").ti,ab EMBASE exp URINALYSIS/ EMBASE (exp "BACTERIUM AND (retest* OR "re test*").ti,ab) AND exp URINALYSIS/ 1 23 EMBASE ("mid urine stream").ti 24 EMBASE exp "URINE CULTURE"/ EMBASE exp "BACTERIUM AND exp "URINE CULTURE"/ CINAHL ("mixed growth").ti,ab CINAHL (midstream OR "mid stream").ti CINAHL (msu).ti CINAHL exp "BACTERIAL CINAHL exp URINALYSIS/ CINAHL exp "BACTERIAL AND exp URINALYSIS/ EMBASE (urine culture contamination).ti 7 33 EMBASE *"URINE CULTURE"/ 876
6 34 EMBASE exp "BACTERIUM AND *"URINE CULTURE"/ 35 EMBASE ("mixed culture" OR "mixed flora").ti EMBASE ((midstream OR "mid stream").ti 1 OR (msu).ti) AND ("mixed culture" OR "mixed flora").ti 37 EMBASE exp URINALYSIS/ AND ("mixed 3 culture" OR "mixed flora").ti 38 EMBASE exp "URINE CULTURE"/ AND ("mixed culture" OR "mixed flora").ti 39 Medline ("mixed culture" OR "mixed flora").ti 4 Medline (midstream OR "mid stream").ti AND ("mixed culture" OR "mixed flora").ti 41 Medline exp "URINE SPECIMEN COLLECTION"/ 42 Medline ("mixed culture" OR "mixed flora").ti AND exp "URINE SPECIMEN COLLECTION"/ Medline exp URINALYSIS/ Medline ("mixed culture" OR "mixed flora").ti AND exp URINALYSIS/ 45 Medline ("multiple growth").ti,ab Medline exp URINALYSIS/ AND ("multiple growth").ti,ab 47 Medline exp "URINE SPECIMEN COLLECTION"/ AND ("multiple growth").ti,ab 48 Medline ("polymicrobial growth").ti,ab 55
7 49 Medline exp URINALYSIS/ AND ("polymicrobial growth").ti,ab 1 5 Medline (urine culture contamination).ti 9 51 CINAHL exp "URINE SPECIMEN COLLECTION"/ 52 CINAHL exp "BACTERIAL OR exp "MICROBIAL 53 CINAHL exp "URINE SPECIMEN COLLECTION"/ AND (exp "BACTERIAL OR exp "MICROBIAL ) 54 CINAHL ("mixed culture" OR "mixed flora").ti CINAHL ("multiple growth").ti,ab CINAHL ("polymicrobial growth").ti,ab 6 57 CINAHL ("mixed culture" OR "mixed flora").ti OR ("multiple growth").ti,ab OR ("polymicrobial growth").ti,ab CINAHL exp "URINE SPECIMEN COLLECTION"/ AND (("mixed culture" OR "mixed flora").ti OR ("multiple growth").ti,ab OR ("polymicrobial growth").ti,ab) 59 CINAHL exp URINALYSIS/ CINAHL (exp "BACTERIAL OR exp "MICROBIAL ) AND exp URINALYSIS/ 25
8 61 CINAHL (urine contaminat*).ti 1 62 Medline (urine contaminat*).ti EMBASE *CONTAMINATION/ EMBASE *URINALYSIS/ EMBASE *CONTAMINATION/ AND *URINALYSIS/ 66 EMBASE *"BACTERIUM 67 EMBASE *URINALYSIS/ AND *"BACTERIUM 68 EMBASE exp "CREATININE URINE LEVEL"/ EMBASE *"BACTERIUM AND exp "CREATININE URINE LEVEL"/ 7 EMBASE *CONTAMINATION/ AND exp "CREATININE URINE LEVEL"/ 71 EMBASE *"URINE CULTURE"/ EMBASE *"BACTERIUM AND *"URINE CULTURE"/ 73 EMBASE *CONTAMINATION/ AND *"URINE CULTURE"/ EMBASE (urine contamin*).ti EMBASE *"MICROBIAL GROWTH"/ EMBASE *"URINE CULTURE"/ AND *"MICROBIAL GROWTH"/ 77 EMBASE *URINALYSIS/ AND *"MICROBIAL GROWTH"/ 1
9 78 EMBASE (urin*).ti EMBASE *URINALYSIS/ AND *"MICROBIAL GROWTH"/ 8 EMBASE *"MICROBIAL GROWTH"/ AND 5 (urin*).ti 81 EMBASE exp PROTEINURIA/ EMBASE *"MICROBIAL GROWTH"/ AND exp PROTEINURIA/ 83 EMBASE *"MICROBIAL GROWTH"/ AND 5 (urin*).ti 84 EMBASE exp "MICROBIAL GROWTH"/ EMBASE *"URINE CULTURE"/ AND exp "MICROBIAL GROWTH"/ EMBASE exp "BACTERIAL COUNT"/ EMBASE *"URINE CULTURE"/ AND exp "BACTERIAL COUNT"/ Medline (growth).ti,ab Medline exp "URINE SPECIMEN COLLECTION"/ AND (growth).ti,ab 9 Medline exp URINALYSIS/ AND (growth).ti,ab Medline (urine contamin*).ti EMBASE exp "PROTEIN URINE LEVEL"/ EMBASE *"MICROBIAL GROWTH"/ AND exp "PROTEIN URINE LEVEL"/ 94 EMBASE exp "BACTERIAL COUNT"/ AND exp "PROTEIN URINE LEVEL"/ 4
10 95 EMBASE *"BACTERIUM AND exp "PROTEIN URINE LEVEL"/ 96 EMBASE *CONTAMINATION/ AND exp "PROTEIN URINE LEVEL"/ EMBASE (contamin* OR growth).ti EMBASE exp "PROTEIN URINE LEVEL"/ 317 AND (contamin* OR growth).ti 99 EMBASE (urin*).ti EMBASE (exp "PROTEIN URINE LEVEL"/ AND (contamin* OR growth).ti) AND (urin*).ti 11 EMBASE exp "MICROBIAL GROWTH"/ AND (exp "PROTEIN URINE LEVEL"/ AND (contamin* OR growth).ti) 12 EMBASE exp "MICROBIAL GROWTH"/ AND exp "PROTEIN URINE LEVEL"/ EMBASE (overgrowth).ti,ab EMBASE exp "URINE CULTURE"/ AND (overgrowth).ti,ab 8
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